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GMC
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1990
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S15 Pickup 2D Pickup, 2.8 R
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Repair and Diagnosis
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Engine Performance
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Engine Controls - Specifications
Engine Controls - Specifications
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Introduction
Capacities
Quick-Service
Service Intervals & Specifications
Mechanical Checks
Engine Compression
Valve Clearance
4-Cylinder Valve Arrangement
2.5L (VIN E)
V6 Valve Arrangement
2.8L (VIN R)
3.1L (VIN D)
4.3L (VIN Z)
V8 Valve Arrangement
5.0L (VIN H)
5.7L (VIN K)
6.2L (VIN C)
7.4L (VIN N)
Ignition System
Ignition Coil
High Tension Wire Resistance
Spark Plugs
Firing Order & Timing Marks
2.5L (VIN E) Firing Order & Timing Marks
2.8L (VIN R) Firing Order & Timing Marks
3.1L (VIN D) Firing Order & Timing Marks
4.3L (VIN Z) Firing Order & Timing Marks
5.0L, 5.7L & 7.4L Firing Order & Timing Marks
6.2L Diesel Engine Firing Order
Ignition Timing
Fuel System
Fuel Pump
Injector Resistance
Idle Speed & Mixture
Throttle Position Sensor (TPS)